SEGMENTS - Major Product Categories and Percentage of Consolidated Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Product Information [Line Items]
Net sales	$ 632,828	$ 655,150	$ 1,940,400	$ 1,844,680
Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	100.00%	100.00%	100.00%	100.00%
Eliminations
Product Information [Line Items]
Net sales	$ (6,483)	$ (3,357)	$ (16,870)	$ (8,977)
Transportation Solutions
Product Information [Line Items]
Net sales	577,232	609,490	1,778,246	1,703,655
Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	582,870	611,779	1,791,623	1,709,826
Transportation Solutions \| Eliminations
Product Information [Line Items]
Net sales	5,638	2,289	13,377	6,171
Parts & Services
Product Information [Line Items]
Net sales	55,596	45,660	162,154	141,025
Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	56,441	46,728	165,647	143,831
Parts & Services \| Eliminations
Product Information [Line Items]
Net sales	845	1,068	3,493	2,806
New trailers
Product Information [Line Items]
Net sales	$ 475,586	$ 530,508	$ 1,482,007	$ 1,476,471
New trailers \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	75.20%	81.00%	76.40%	80.00%
New trailers \| Eliminations
Product Information [Line Items]
Net sales	$ (2,216)	$ (301)	$ (4,580)	$ (973)
New trailers \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	477,802	529,659	1,486,587	1,476,052
New trailers \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	0	1,150	0	1,392
Used trailers
Product Information [Line Items]
Net sales	$ 1,340	$ 693	$ 2,396	$ 2,382
Used trailers \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	0.20%	0.10%	0.10%	0.10%
Used trailers \| Eliminations
Product Information [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0
Used trailers \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	0	0	0	0
Used trailers \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	1,340	693	2,396	2,382
Components, parts and services
Product Information [Line Items]
Net sales	$ 38,091	$ 34,171	$ 113,567	$ 105,208
Components, parts and services \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	6.00%	5.20%	5.90%	5.70%
Components, parts and services \| Eliminations
Product Information [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0
Components, parts and services \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	0	0	0	0
Components, parts and services \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	38,091	34,171	113,567	105,208
Equipment and other
Product Information [Line Items]
Net sales	$ 117,811	$ 89,778	$ 342,430	$ 260,619
Equipment and other \| Sales Revenue, Net \| Product Concentration Risk
Product Information [Line Items]
Percentage of consolidated net sales	18.60%	13.70%	17.60%	14.10%
Equipment and other \| Eliminations
Product Information [Line Items]
Net sales	$ (4,267)	$ (3,056)	$ (12,290)	$ (8,004)
Equipment and other \| Transportation Solutions \| Operating Segments
Product Information [Line Items]
Net sales	105,068	82,120	305,036	233,774
Equipment and other \| Parts & Services \| Operating Segments
Product Information [Line Items]
Net sales	$ 17,010	$ 10,714	$ 49,684	$ 34,849